mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-25 11:37:56 +00:00
d7ee48f115
the OpenBSD tree and should be considered preliminary. They are here to facilitate building of the tree.
76 lines
2.9 KiB
ArmAsm
76 lines
2.9 KiB
ArmAsm
/*-
|
|
* Copyright (c) 1991, 1993, 1995
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Ralph Campbell.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <machine/asm.h>
|
|
|
|
#if defined(LIBC_SCCS)
|
|
.text
|
|
.asciz "$OpenBSD$"
|
|
#endif /* LIBC_SCCS */
|
|
|
|
/*
|
|
* double modf(val, iptr)
|
|
* double val, *iptr;
|
|
* returns: xxx and n (in *iptr) where val == n.xxx
|
|
*/
|
|
LEAF(modf)
|
|
.set reorder
|
|
cfc1 t0, $31 # get the control register
|
|
li.d $f2, 4503599627370496e0 # f2 <- 2^52
|
|
|
|
or t1, t0, 0x3 # set rounding mode to round to zero
|
|
xor t1, t1, 0x2 # (i.e., 01)
|
|
ctc1 t1, $31
|
|
|
|
mov.d $f0, $f12 # f0 <- f12
|
|
abs.d $f4, $f12 # f4 <- |f12|
|
|
c.olt.d $f4, $f2 # f4 ? < f2
|
|
bc1f 1f # leave f0 alone if Nan, infinity
|
|
# or >=2^52
|
|
c.eq.d $f12,$f4 # was f12 positive ?
|
|
add.d $f4,$f2,$f4 # round off to integer
|
|
bc1f 2f # No -> will have to negate result
|
|
sub.d $f0,$f4,$f2 # Remove fudge factor
|
|
j 1f # integer fraction got
|
|
2:
|
|
sub.d $f0,$f2,$f4 # Remove fudge factor and negate
|
|
1:
|
|
ctc1 t0, $31 # restore old rounding mode
|
|
s.d $f0, 0(a2) # save the integer part
|
|
sub.d $f0, $f12, $f0 # subtract val - integer part
|
|
j ra
|
|
END(modf)
|